JPS6232496B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a system using a magnetic disk device, particularly a disk system in which data between disks is transferred to another separately prepared disk and data on the disk is backed up. This allows data to be backed up without complicated operations.

In systems using magnetic disk drives, there is a possibility that the data recorded on the magnetic recording surface may be destroyed or become unreadable for some reason; for example, due to a collision between the read/write head and the disk. There is a problem with the head crash or the playback amplifier in the head section. In the case of headcrash,
The head may become defective or otherwise corrupt some data surface, making it impossible to reproduce the data at that location. In addition, in the former case,
It is possible to repair it, but it will take a considerable amount of time. Therefore, the data on the disk must always be backed up in some way.

FIG. 1 is a configuration diagram for explaining an example of a normal disk device. In the figure, 1 is a CPU device, 2 is a command conversion device, 3 is a disk control device, and 4 and 5 are disk devices. like,
The command information for the disk control device output from the CPU device 1 is appropriately converted by the command conversion device 2 and sent to the disk control device 3, which is interpreted by the disk control device 3 to control the disk device 4 or 5. There is. However, in the conventional system described above, all commands to drive the disk devices 4 and 5 are
Therefore, even if it is necessary to transfer data between disk devices 4 and 5, the data is sent from disk device 4 to CPU device 1 once, and then the data is sent to CPU device 1 again. Device 1
The data will be transferred from there to the disk device 5.

As mentioned above, conventional disk systems are: (1) equipped with two disk devices as a system, and based on instructions from the CPU device, these two disk devices are
(2) Use one disk and separately install another file device (MT device, etc.) for backup; (1)
As in the case of , data transfer between the disk device and the backup device is performed under control from the CPU device.

However, in any case, the conventional disk system described above performs data transfer based on commands from the CPU device, so during that time,
This placed a considerable load on the CPU and had the disadvantages of complicating operations for the operator.

The present invention eliminates the drawbacks of the conventional system as described above and makes it possible to back up data without performing complicated operations.

FIG. 2 is a configuration diagram for explaining an embodiment of the disk system according to the present invention, and in the figure, 11 is
12 is a command conversion device, 13 is a disk control device, 14 and 15 are disk devices,
The command conversion device 12, as shown in FIG.
Command input latch circuit 21, internal CPU circuit 2
2, a ROM address control circuit 23, a program storage ROM 24, a command output latch circuit 25, etc. In a computer system that has a normal host computer and a magnetic disk, the command system of the host computer and the internal command system of the magnetic disk system are generally different. In this case, the command conversion device 12 described in detail below is required between the host computer and the magnetic disk device.
That is, a means for converting host computer commands into commands suitable for the magnetic disk control device is required, and the internal CPU 22 and program storage ROM 24 are used for this purpose. A command conversion program for interpreting commands and having the magnetic disk device execute them is stored as program B. now,
When a disk control command from the CPU device (HOST CPU) 11 is set to the command input latch circuit 21 through the CPU data bus 31, the internal CPU circuit 22 transfers this data to the internal bus 34.
It interprets the command information from the CPU device 11, which is the host computer, and converts it into a command to be used by the magnetic disk device.The result is sent to the command output latch circuit 25 via the internal bus 34 as needed. Output to. The data of this command output latch circuit 25 is transmitted to the disk controller 13 through the data bus 35.
Output to. At that time, in normal operation,
The internal CPU circuit 22 has a program storage ROM 24
When the switch 26 is closed, the output of the ROM address control circuit 23, that is, the bus 33, is changed, and the internal
The CPU circuit 22 comes to operate according to the data (program) in part A of the program storage ROM 24. Therefore, during normal operation, the internal CPU circuit 22 interprets and executes command information from the CPU device 11 under the control of the program in part B of the program storage ROM 24, and when the switch 26 is turned on, , interrupts the internal CPU circuit 22 through the lead wire 32, and at the same time changes the contents of the ROM address control circuit 23 and stores the program.
The internal CPU is controlled by the program in part A of ROM24.
Restart the circuit 22 and restart the internal CPU circuit 22.
is made to function by program A. Therefore, the data stored in the disk device 14 is stored in the disk device 1 in part A.
If you enter a command to transfer to 5,
Regardless of the CPU device 11, the disk device 14
data can be automatically transferred to the disk device 15.

As is clear from the above description, according to the present invention, data on a disk can be transferred (i.e., RACK UP) without putting a load on the CPU device, and in that case, simply turning on a switch is enough to transfer data on the disk. It has the advantage of being extremely easy to operate.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining a normal disk system, FIG. 2 is a block diagram for explaining an embodiment of a disk system according to the present invention, and FIG. 3 is a block diagram for explaining an embodiment of a disk system according to the present invention. 1 is a configuration diagram of main parts of a command conversion device 12. FIG. 1, 11... CPU device, 2, 12... Command conversion device, 3, 13... Disk control device,
4, 5, 14, 15...disk device, 21...
Command input latch circuit, 22... Internal CPU circuit, 23... ROM address control circuit, 24...
Program storage ROM, 25... Command output latch circuit.

Claims (1)

[Claims] 1 A CPU device, a disk control device, and the above-mentioned
In a disk system comprising a command conversion device that appropriately converts command information from a CPU device and transmits the converted command information to the disk control device, the command conversion device is provided with switching means, and the switching device converts command information from the CPU device. to the disk control device, or to transfer command information registered in advance in the command conversion device to the disk control device, and the data in the disk device is separately prepared. 1. A disk system characterized in that when transferring to another disk device, it is possible to perform the transfer independently of the CPU device by using command information registered in advance in the command conversion device.